Android System Android system framework? Apk file name: framework-res Could be THE core of the android system. But anyway, rest assured it's impossible to update this package without replacing the entire package or without rom OTA update.

If you download this, all you can do is explore, see XML image files, texts you've never seen in your life, but you have to see ridiculous solutions Google came up with to avoid breaking the… You just need to use your MT Manager or any other file manager that can basically open APKs.